This is number 41 in Flush's series of radio tapes. This one features recordings from Power 99 in Philadelphia and a KISS-FM Mastermix from New York City. It is likely from 1986 (with some of Side B possibly from 1987).
There's a fantastic Power 99/Lady B/Street Beat ID by Philly's own Ice Cream Tee on side B. It's followed by two other rarities well worth checking out.